Three years ago I had my sidewalks coated with decorative stone from Sierra Stone. Two year later small rusty brown stains began to appear. This year I unsuccessfully tried to remove the stains using various products. When I sent in a picture and called Sierra Stone they could not help. I talked to the sales manager who told me that some of the rock product used can contain iron which rusts naturally over time. The company had no suggestions for fixing the problem. The sidewalks are coated with epoxy which logically would need to be removed before applying cleaning product, with no surety that the stain removal would work so no solution in sight.
